[Desktop Linux]: Fix copy and pasting long selections

ui/base/x/selection_owner.h

Index: ui/base/x/selection_owner.h
diff --git a/ui/base/x/selection_owner.h b/ui/base/x/selection_owner.h
index fd2326c9752151a0f129f7ae38cf0882812439c7..52657e34c2c97ba633939d5173e66a8eb62042d9 100644
--- a/ui/base/x/selection_owner.h
+++ b/ui/base/x/selection_owner.h
@@ -65,18 +65,25 @@ class UI_BASE_EXPORT SelectionOwner {
     IncrementalTransfer(XID window,
                         XAtom target,
                         XAtom property,
+                        std::unique_ptr<XScopedEventSelector> event_selector,
                         const scoped_refptr<base::RefCountedMemory>& data,
                         int offset,
                         base::TimeTicks timeout);
-    IncrementalTransfer(const IncrementalTransfer& other);
     ~IncrementalTransfer();
 
+    // Move-only class.
+    IncrementalTransfer(IncrementalTransfer&&);
+    IncrementalTransfer& operator=(IncrementalTransfer&&);
+
     // Parameters from the XSelectionRequest. The data is transferred over
     // |property| on |window|.
     XID window;
     XAtom target;
     XAtom property;
 
+    // Selects events on |window|.
+    std::unique_ptr<XScopedEventSelector> event_selector;
+
     // The data to be transferred.
     scoped_refptr<base::RefCountedMemory> data;
 
@@ -87,6 +94,9 @@ class UI_BASE_EXPORT SelectionOwner {
     // Time when the transfer should be aborted because the selection requestor
     // is taking too long to notify us that we can send the next chunk.
     base::TimeTicks timeout;
+
+   private:
+    DISALLOW_COPY_AND_ASSIGN(IncrementalTransfer);
   };
 
   // Attempts to convert the selection to |target|. If the conversion is
@@ -113,9 +123,6 @@ class UI_BASE_EXPORT SelectionOwner {
   XDisplay* x_display_;
   XID x_window_;
 
-  // Events selected on the requesting window.
-  std::unique_ptr<XScopedEventSelector> requestor_events_;
-
   // The X11 selection that this instance communicates on.
   XAtom selection_name_;